When Are Vintage Posters Truly Valuable

From Cassandre to Andy Warhol: When Are Vintage Posters Truly Valuable?

Posters have been popular among history collectors for years. These collectors search the internet and collectors fairs on and off for that particular poster that will complete their collection, but how do you know if a poster is valuable not only for you but other collectors as well. We asked Arjan den Boer, poster expert at Catawiki, for advice on which aspects a poster is estimated to the determine its value for now and in the future.
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